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Do make sure that you have taken a backup of the personal data on your Android phone, before starting the rooting of it.
Backup personal data of Android Phone.

Now, follow these instructions to root the Samsung Galaxy Trend Duos:

Download the One Click Root tool from the official website:Downloading Now
Connect the phone to the computer using the MicroUSB cable
Enable the USB debugging mode on the phone (go to Settings > Development / Developer > USB Debugging)
Open the One Click Root software and wait for the tool to recognize the phone, and list it there
Click on “Root Now” and the software would do the next process.

The models which are tested to work with this tool include Galaxy Trend Duos, Samsung Galaxy Trend Duos, Samsung Trend Duos. The method is tested to work well and has bricked the phone, and thus is a safe one to use to root Samsung Galaxy Trend Duos II.

One of the best things you can do after rooting the Galaxy Trend Duos includes the installation of the custom ROMs which include CyanogenMod 10, DarkyROM, AOKP, MIUI etc. Once you have rooted your phone, do download the Root Checker app from Play Store to check if the rooting process happened right or not.

- Entering the Download Mode:
Put the battery back into your device, Press and Hold Volume Down key + Home key + Power, After you get the warning message release all keys and press Volume Up key.

- Use the USB cable to connect your device to the computer, Don't use any USB-HUB for connecting, And use only main USB slots.

- Wait until Windows detects the connected device and installs its suitable USB drivers.
- In case everything is OK, Then Odin program will detect your connected device (0:[COMxx]).
- Click on Start button.
- Odin program will start installing the new firmware files into your device, So wait until the device reboots.
- If the update was successfully done, Then you will notice PASS! Word at Odin program.
- Disconnect the USB cable.
- Check your device firmware version *#1234# (You should see the new installed one).
- Turn off the device again, Reinsert the SIM and memory cards and turn it on.
- Now you can customize your device after installing the new firmware version.
- If you made any backup of your device data before the update then you can restore it again.
- Done.

Notice: When you get one big file inside the firmware package, Then it should be selected as a PDA file only, And do not check Re-Partition option or use PIT file at all.

I have a problem, I want to unlock my Samsung Galaxy Trend Lite S7390. Can I be able to unlock it using the Odin3, by following some steps?
My phone is locked to one network and the charges are way to high.